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Abstract

Very large-mode-area Yb3+-doped single-mode photonic bandgap (PBG) Bragg fiber oscillators are considered. The transverse hole-burning effect is numerically modeled, which helps properly design the PBG cladding and the Yb3+-doped region for the high-order mode content to be carefully controlled. A ratio of the Yb3+-doped region diameter to the overall core diameter of 40% allows for single-mode emission, even for small spool diameters of 15cm. Such a fiber was manufactured and subsequently used as the core element of a cw oscillator. Very good beam quality parameter M2=1.12 and slope efficiency of 80% were measured. Insensitivity to bending, exemplified by the absence of temporal drift of the beam, was demonstrated for curvature diameter as small as 15cm.

References

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